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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / security / tomoyo / common.c
blobc47d3ce6c7333146e44eb7894ea56a5dbb427f7f
1 /*
2 * security/tomoyo/common.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14 [TOMOYO_CONFIG_DISABLED] = "disabled",
15 [TOMOYO_CONFIG_LEARNING] = "learning",
16 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23 /* CONFIG::file group */
24 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
25 [TOMOYO_MAC_FILE_OPEN] = "open",
26 [TOMOYO_MAC_FILE_CREATE] = "create",
27 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
28 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
29 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
30 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
31 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
32 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
33 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
34 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
35 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
36 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
37 [TOMOYO_MAC_FILE_LINK] = "link",
38 [TOMOYO_MAC_FILE_RENAME] = "rename",
39 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
40 [TOMOYO_MAC_FILE_CHOWN] = "chown",
41 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
42 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
43 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
44 [TOMOYO_MAC_FILE_MOUNT] = "mount",
45 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
46 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
47 /* CONFIG::network group */
48 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
49 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
51 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
53 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
54 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
55 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
58 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
60 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
63 /* CONFIG::misc group */
64 [TOMOYO_MAC_ENVIRON] = "env",
65 /* CONFIG group */
66 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
69 };
70
71 /* String table for conditions. */
72 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
73 [TOMOYO_TASK_UID] = "task.uid",
74 [TOMOYO_TASK_EUID] = "task.euid",
75 [TOMOYO_TASK_SUID] = "task.suid",
76 [TOMOYO_TASK_FSUID] = "task.fsuid",
77 [TOMOYO_TASK_GID] = "task.gid",
78 [TOMOYO_TASK_EGID] = "task.egid",
79 [TOMOYO_TASK_SGID] = "task.sgid",
80 [TOMOYO_TASK_FSGID] = "task.fsgid",
81 [TOMOYO_TASK_PID] = "task.pid",
82 [TOMOYO_TASK_PPID] = "task.ppid",
83 [TOMOYO_EXEC_ARGC] = "exec.argc",
84 [TOMOYO_EXEC_ENVC] = "exec.envc",
85 [TOMOYO_TYPE_IS_SOCKET] = "socket",
86 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
87 [TOMOYO_TYPE_IS_FILE] = "file",
88 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
89 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
90 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
91 [TOMOYO_TYPE_IS_FIFO] = "fifo",
92 [TOMOYO_MODE_SETUID] = "setuid",
93 [TOMOYO_MODE_SETGID] = "setgid",
94 [TOMOYO_MODE_STICKY] = "sticky",
95 [TOMOYO_MODE_OWNER_READ] = "owner_read",
96 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
97 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
98 [TOMOYO_MODE_GROUP_READ] = "group_read",
99 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
100 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
101 [TOMOYO_MODE_OTHERS_READ] = "others_read",
102 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
103 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
104 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
105 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
106 [TOMOYO_PATH1_UID] = "path1.uid",
107 [TOMOYO_PATH1_GID] = "path1.gid",
108 [TOMOYO_PATH1_INO] = "path1.ino",
109 [TOMOYO_PATH1_MAJOR] = "path1.major",
110 [TOMOYO_PATH1_MINOR] = "path1.minor",
111 [TOMOYO_PATH1_PERM] = "path1.perm",
112 [TOMOYO_PATH1_TYPE] = "path1.type",
113 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
114 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
115 [TOMOYO_PATH2_UID] = "path2.uid",
116 [TOMOYO_PATH2_GID] = "path2.gid",
117 [TOMOYO_PATH2_INO] = "path2.ino",
118 [TOMOYO_PATH2_MAJOR] = "path2.major",
119 [TOMOYO_PATH2_MINOR] = "path2.minor",
120 [TOMOYO_PATH2_PERM] = "path2.perm",
121 [TOMOYO_PATH2_TYPE] = "path2.type",
122 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
123 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
124 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
125 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
126 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
127 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
128 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
129 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
130 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
131 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
132 };
133
134 /* String table for PREFERENCE keyword. */
135 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
136 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
137 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
138 };
139
140 /* String table for path operation. */
141 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
142 [TOMOYO_TYPE_EXECUTE] = "execute",
143 [TOMOYO_TYPE_READ] = "read",
144 [TOMOYO_TYPE_WRITE] = "write",
145 [TOMOYO_TYPE_APPEND] = "append",
146 [TOMOYO_TYPE_UNLINK] = "unlink",
147 [TOMOYO_TYPE_GETATTR] = "getattr",
148 [TOMOYO_TYPE_RMDIR] = "rmdir",
149 [TOMOYO_TYPE_TRUNCATE] = "truncate",
150 [TOMOYO_TYPE_SYMLINK] = "symlink",
151 [TOMOYO_TYPE_CHROOT] = "chroot",
152 [TOMOYO_TYPE_UMOUNT] = "unmount",
153 };
154
155 /* String table for socket's operation. */
156 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
157 [TOMOYO_NETWORK_BIND] = "bind",
158 [TOMOYO_NETWORK_LISTEN] = "listen",
159 [TOMOYO_NETWORK_CONNECT] = "connect",
160 [TOMOYO_NETWORK_SEND] = "send",
161 };
162
163 /* String table for categories. */
164 static const char * const tomoyo_category_keywords
165 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
166 [TOMOYO_MAC_CATEGORY_FILE] = "file",
167 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
168 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
169 };
170
171 /* Permit policy management by non-root user? */
172 static bool tomoyo_manage_by_non_root;
173
174 /* Utility functions. */
175
176 /**
177 * tomoyo_yesno - Return "yes" or "no".
178 *
179 * @value: Bool value.
180 */
181 const char *tomoyo_yesno(const unsigned int value)
182 {
183 return value ? "yes" : "no";
184 }
185
186 /**
187 * tomoyo_addprintf - strncat()-like-snprintf().
188 *
189 * @buffer: Buffer to write to. Must be '\0'-terminated.
190 * @len: Size of @buffer.
191 * @fmt: The printf()'s format string, followed by parameters.
192 *
193 * Returns nothing.
194 */
195 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
196 {
197 va_list args;
198 const int pos = strlen(buffer);
199 va_start(args, fmt);
200 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
201 va_end(args);
202 }
203
204 /**
205 * tomoyo_flush - Flush queued string to userspace's buffer.
206 *
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 *
209 * Returns true if all data was flushed, false otherwise.
210 */
211 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
212 {
213 while (head->r.w_pos) {
214 const char *w = head->r.w[0];
215 size_t len = strlen(w);
216 if (len) {
217 if (len > head->read_user_buf_avail)
218 len = head->read_user_buf_avail;
219 if (!len)
220 return false;
221 if (copy_to_user(head->read_user_buf, w, len))
222 return false;
223 head->read_user_buf_avail -= len;
224 head->read_user_buf += len;
225 w += len;
226 }
227 head->r.w[0] = w;
228 if (*w)
229 return false;
230 /* Add '\0' for audit logs and query. */
231 if (head->poll) {
232 if (!head->read_user_buf_avail ||
233 copy_to_user(head->read_user_buf, "", 1))
234 return false;
235 head->read_user_buf_avail--;
236 head->read_user_buf++;
237 }
238 head->r.w_pos--;
239 for (len = 0; len < head->r.w_pos; len++)
240 head->r.w[len] = head->r.w[len + 1];
241 }
242 head->r.avail = 0;
243 return true;
244 }
245
246 /**
247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
248 *
249 * @head: Pointer to "struct tomoyo_io_buffer".
250 * @string: String to print.
251 *
252 * Note that @string has to be kept valid until @head is kfree()d.
253 * This means that char[] allocated on stack memory cannot be passed to
254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
255 */
256 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
257 {
258 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
259 head->r.w[head->r.w_pos++] = string;
260 tomoyo_flush(head);
261 } else
262 WARN_ON(1);
263 }
264
265 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
266 ...) __printf(2, 3);
267
268 /**
269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
270 *
271 * @head: Pointer to "struct tomoyo_io_buffer".
272 * @fmt: The printf()'s format string, followed by parameters.
273 */
274 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
275 ...)
276 {
277 va_list args;
278 size_t len;
279 size_t pos = head->r.avail;
280 int size = head->readbuf_size - pos;
281 if (size <= 0)
282 return;
283 va_start(args, fmt);
284 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
285 va_end(args);
286 if (pos + len >= head->readbuf_size) {
287 WARN_ON(1);
288 return;
289 }
290 head->r.avail += len;
291 tomoyo_set_string(head, head->read_buf + pos);
292 }
293
294 /**
295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
296 *
297 * @head: Pointer to "struct tomoyo_io_buffer".
298 *
299 * Returns nothing.
300 */
301 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
302 {
303 tomoyo_set_string(head, " ");
304 }
305
306 /**
307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
308 *
309 * @head: Pointer to "struct tomoyo_io_buffer".
310 *
311 * Returns nothing.
312 */
313 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
314 {
315 tomoyo_set_string(head, "\n");
316 return !head->r.w_pos;
317 }
318
319 /**
320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
321 *
322 * @head: Pointer to "struct tomoyo_io_buffer".
323 *
324 * Returns nothing.
325 */
326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
327 {
328 tomoyo_set_string(head, "/");
329 }
330
331 /* List of namespaces. */
332 LIST_HEAD(tomoyo_namespace_list);
333 /* True if namespace other than tomoyo_kernel_namespace is defined. */
334 static bool tomoyo_namespace_enabled;
335
336 /**
337 * tomoyo_init_policy_namespace - Initialize namespace.
338 *
339 * @ns: Pointer to "struct tomoyo_policy_namespace".
340 *
341 * Returns nothing.
342 */
343 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
344 {
345 unsigned int idx;
346 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
347 INIT_LIST_HEAD(&ns->acl_group[idx]);
348 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
349 INIT_LIST_HEAD(&ns->group_list[idx]);
350 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
351 INIT_LIST_HEAD(&ns->policy_list[idx]);
352 ns->profile_version = 20110903;
353 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
354 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
355 }
356
357 /**
358 * tomoyo_print_namespace - Print namespace header.
359 *
360 * @head: Pointer to "struct tomoyo_io_buffer".
361 *
362 * Returns nothing.
363 */
364 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
365 {
366 if (!tomoyo_namespace_enabled)
367 return;
368 tomoyo_set_string(head,
369 container_of(head->r.ns,
370 struct tomoyo_policy_namespace,
371 namespace_list)->name);
372 tomoyo_set_space(head);
373 }
374
375 /**
376 * tomoyo_print_name_union - Print a tomoyo_name_union.
377 *
378 * @head: Pointer to "struct tomoyo_io_buffer".
379 * @ptr: Pointer to "struct tomoyo_name_union".
380 */
381 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
382 const struct tomoyo_name_union *ptr)
383 {
384 tomoyo_set_space(head);
385 if (ptr->group) {
386 tomoyo_set_string(head, "@");
387 tomoyo_set_string(head, ptr->group->group_name->name);
388 } else {
389 tomoyo_set_string(head, ptr->filename->name);
390 }
391 }
392
393 /**
394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
395 *
396 * @head: Pointer to "struct tomoyo_io_buffer".
397 * @ptr: Pointer to "struct tomoyo_name_union".
398 *
399 * Returns nothing.
400 */
401 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
402 const struct tomoyo_name_union *ptr)
403 {
404 if (ptr->group) {
405 tomoyo_set_string(head, "@");
406 tomoyo_set_string(head, ptr->group->group_name->name);
407 } else {
408 tomoyo_set_string(head, "\"");
409 tomoyo_set_string(head, ptr->filename->name);
410 tomoyo_set_string(head, "\"");
411 }
412 }
413
414 /**
415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
416 *
417 * @head: Pointer to "struct tomoyo_io_buffer".
418 * @ptr: Pointer to "struct tomoyo_number_union".
419 *
420 * Returns nothing.
421 */
422 static void tomoyo_print_number_union_nospace
423 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
424 {
425 if (ptr->group) {
426 tomoyo_set_string(head, "@");
427 tomoyo_set_string(head, ptr->group->group_name->name);
428 } else {
429 int i;
430 unsigned long min = ptr->values[0];
431 const unsigned long max = ptr->values[1];
432 u8 min_type = ptr->value_type[0];
433 const u8 max_type = ptr->value_type[1];
434 char buffer[128];
435 buffer[0] = '\0';
436 for (i = 0; i < 2; i++) {
437 switch (min_type) {
438 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
439 tomoyo_addprintf(buffer, sizeof(buffer),
440 "0x%lX", min);
441 break;
442 case TOMOYO_VALUE_TYPE_OCTAL:
443 tomoyo_addprintf(buffer, sizeof(buffer),
444 "0%lo", min);
445 break;
446 default:
447 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
448 min);
449 break;
450 }
451 if (min == max && min_type == max_type)
452 break;
453 tomoyo_addprintf(buffer, sizeof(buffer), "-");
454 min_type = max_type;
455 min = max;
456 }
457 tomoyo_io_printf(head, "%s", buffer);
458 }
459 }
460
461 /**
462 * tomoyo_print_number_union - Print a tomoyo_number_union.
463 *
464 * @head: Pointer to "struct tomoyo_io_buffer".
465 * @ptr: Pointer to "struct tomoyo_number_union".
466 *
467 * Returns nothing.
468 */
469 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
470 const struct tomoyo_number_union *ptr)
471 {
472 tomoyo_set_space(head);
473 tomoyo_print_number_union_nospace(head, ptr);
474 }
475
476 /**
477 * tomoyo_assign_profile - Create a new profile.
478 *
479 * @ns: Pointer to "struct tomoyo_policy_namespace".
480 * @profile: Profile number to create.
481 *
482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
483 */
484 static struct tomoyo_profile *tomoyo_assign_profile
485 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
486 {
487 struct tomoyo_profile *ptr;
488 struct tomoyo_profile *entry;
489 if (profile >= TOMOYO_MAX_PROFILES)
490 return NULL;
491 ptr = ns->profile_ptr[profile];
492 if (ptr)
493 return ptr;
494 entry = kzalloc(sizeof(*entry), GFP_NOFS);
495 if (mutex_lock_interruptible(&tomoyo_policy_lock))
496 goto out;
497 ptr = ns->profile_ptr[profile];
498 if (!ptr && tomoyo_memory_ok(entry)) {
499 ptr = entry;
500 ptr->default_config = TOMOYO_CONFIG_DISABLED |
501 TOMOYO_CONFIG_WANT_GRANT_LOG |
502 TOMOYO_CONFIG_WANT_REJECT_LOG;
503 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
504 sizeof(ptr->config));
505 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
506 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
507 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
508 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
509 mb(); /* Avoid out-of-order execution. */
510 ns->profile_ptr[profile] = ptr;
511 entry = NULL;
512 }
513 mutex_unlock(&tomoyo_policy_lock);
514 out:
515 kfree(entry);
516 return ptr;
517 }
518
519 /**
520 * tomoyo_profile - Find a profile.
521 *
522 * @ns: Pointer to "struct tomoyo_policy_namespace".
523 * @profile: Profile number to find.
524 *
525 * Returns pointer to "struct tomoyo_profile".
526 */
527 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
528 const u8 profile)
529 {
530 static struct tomoyo_profile tomoyo_null_profile;
531 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
532 if (!ptr)
533 ptr = &tomoyo_null_profile;
534 return ptr;
535 }
536
537 /**
538 * tomoyo_find_yesno - Find values for specified keyword.
539 *
540 * @string: String to check.
541 * @find: Name of keyword.
542 *
543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
544 */
545 static s8 tomoyo_find_yesno(const char *string, const char *find)
546 {
547 const char *cp = strstr(string, find);
548 if (cp) {
549 cp += strlen(find);
550 if (!strncmp(cp, "=yes", 4))
551 return 1;
552 else if (!strncmp(cp, "=no", 3))
553 return 0;
554 }
555 return -1;
556 }
557
558 /**
559 * tomoyo_set_uint - Set value for specified preference.
560 *
561 * @i: Pointer to "unsigned int".
562 * @string: String to check.
563 * @find: Name of keyword.
564 *
565 * Returns nothing.
566 */
567 static void tomoyo_set_uint(unsigned int *i, const char *string,
568 const char *find)
569 {
570 const char *cp = strstr(string, find);
571 if (cp)
572 sscanf(cp + strlen(find), "=%u", i);
573 }
574
575 /**
576 * tomoyo_set_mode - Set mode for specified profile.
577 *
578 * @name: Name of functionality.
579 * @value: Mode for @name.
580 * @profile: Pointer to "struct tomoyo_profile".
581 *
582 * Returns 0 on success, negative value otherwise.
583 */
584 static int tomoyo_set_mode(char *name, const char *value,
585 struct tomoyo_profile *profile)
586 {
587 u8 i;
588 u8 config;
589 if (!strcmp(name, "CONFIG")) {
590 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
591 config = profile->default_config;
592 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
593 config = 0;
594 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
595 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
596 int len = 0;
597 if (i < TOMOYO_MAX_MAC_INDEX) {
598 const u8 c = tomoyo_index2category[i];
599 const char *category =
600 tomoyo_category_keywords[c];
601 len = strlen(category);
602 if (strncmp(name, category, len) ||
603 name[len++] != ':' || name[len++] != ':')
604 continue;
605 }
606 if (strcmp(name + len, tomoyo_mac_keywords[i]))
607 continue;
608 config = profile->config[i];
609 break;
610 }
611 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
612 return -EINVAL;
613 } else {
614 return -EINVAL;
615 }
616 if (strstr(value, "use_default")) {
617 config = TOMOYO_CONFIG_USE_DEFAULT;
618 } else {
619 u8 mode;
620 for (mode = 0; mode < 4; mode++)
621 if (strstr(value, tomoyo_mode[mode]))
622 /*
623 * Update lower 3 bits in order to distinguish
624 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
625 */
626 config = (config & ~7) | mode;
627 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
628 switch (tomoyo_find_yesno(value, "grant_log")) {
629 case 1:
630 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
631 break;
632 case 0:
633 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
634 break;
635 }
636 switch (tomoyo_find_yesno(value, "reject_log")) {
637 case 1:
638 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
639 break;
640 case 0:
641 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
642 break;
643 }
644 }
645 }
646 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
647 profile->config[i] = config;
648 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
649 profile->default_config = config;
650 return 0;
651 }
652
653 /**
654 * tomoyo_write_profile - Write profile table.
655 *
656 * @head: Pointer to "struct tomoyo_io_buffer".
657 *
658 * Returns 0 on success, negative value otherwise.
659 */
660 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
661 {
662 char *data = head->write_buf;
663 unsigned int i;
664 char *cp;
665 struct tomoyo_profile *profile;
666 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
667 == 1)
668 return 0;
669 i = simple_strtoul(data, &cp, 10);
670 if (*cp != '-')
671 return -EINVAL;
672 data = cp + 1;
673 profile = tomoyo_assign_profile(head->w.ns, i);
674 if (!profile)
675 return -EINVAL;
676 cp = strchr(data, '=');
677 if (!cp)
678 return -EINVAL;
679 *cp++ = '\0';
680 if (!strcmp(data, "COMMENT")) {
681 static DEFINE_SPINLOCK(lock);
682 const struct tomoyo_path_info *new_comment
683 = tomoyo_get_name(cp);
684 const struct tomoyo_path_info *old_comment;
685 if (!new_comment)
686 return -ENOMEM;
687 spin_lock(&lock);
688 old_comment = profile->comment;
689 profile->comment = new_comment;
690 spin_unlock(&lock);
691 tomoyo_put_name(old_comment);
692 return 0;
693 }
694 if (!strcmp(data, "PREFERENCE")) {
695 for (i = 0; i < TOMOYO_MAX_PREF; i++)
696 tomoyo_set_uint(&profile->pref[i], cp,
697 tomoyo_pref_keywords[i]);
698 return 0;
699 }
700 return tomoyo_set_mode(data, cp, profile);
701 }
702
703 /**
704 * tomoyo_print_config - Print mode for specified functionality.
705 *
706 * @head: Pointer to "struct tomoyo_io_buffer".
707 * @config: Mode for that functionality.
708 *
709 * Returns nothing.
710 *
711 * Caller prints functionality's name.
712 */
713 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
714 {
715 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
716 tomoyo_mode[config & 3],
717 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
718 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
719 }
720
721 /**
722 * tomoyo_read_profile - Read profile table.
723 *
724 * @head: Pointer to "struct tomoyo_io_buffer".
725 *
726 * Returns nothing.
727 */
728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
729 {
730 u8 index;
731 struct tomoyo_policy_namespace *ns =
732 container_of(head->r.ns, typeof(*ns), namespace_list);
733 const struct tomoyo_profile *profile;
734 if (head->r.eof)
735 return;
736 next:
737 index = head->r.index;
738 profile = ns->profile_ptr[index];
739 switch (head->r.step) {
740 case 0:
741 tomoyo_print_namespace(head);
742 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
743 ns->profile_version);
744 head->r.step++;
745 break;
746 case 1:
747 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
748 head->r.index++)
749 if (ns->profile_ptr[head->r.index])
750 break;
751 if (head->r.index == TOMOYO_MAX_PROFILES) {
752 head->r.eof = true;
753 return;
754 }
755 head->r.step++;
756 break;
757 case 2:
758 {
759 u8 i;
760 const struct tomoyo_path_info *comment =
761 profile->comment;
762 tomoyo_print_namespace(head);
763 tomoyo_io_printf(head, "%u-COMMENT=", index);
764 tomoyo_set_string(head, comment ? comment->name : "");
765 tomoyo_set_lf(head);
766 tomoyo_print_namespace(head);
767 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
768 for (i = 0; i < TOMOYO_MAX_PREF; i++)
769 tomoyo_io_printf(head, "%s=%u ",
770 tomoyo_pref_keywords[i],
771 profile->pref[i]);
772 tomoyo_set_string(head, "}\n");
773 head->r.step++;
774 }
775 break;
776 case 3:
777 {
778 tomoyo_print_namespace(head);
779 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
780 tomoyo_print_config(head, profile->default_config);
781 head->r.bit = 0;
782 head->r.step++;
783 }
784 break;
785 case 4:
786 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
787 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
788 const u8 i = head->r.bit;
789 const u8 config = profile->config[i];
790 if (config == TOMOYO_CONFIG_USE_DEFAULT)
791 continue;
792 tomoyo_print_namespace(head);
793 if (i < TOMOYO_MAX_MAC_INDEX)
794 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
795 index,
796 tomoyo_category_keywords
797 [tomoyo_index2category[i]],
798 tomoyo_mac_keywords[i]);
799 else
800 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
801 tomoyo_mac_keywords[i]);
802 tomoyo_print_config(head, config);
803 head->r.bit++;
804 break;
805 }
806 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
807 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
808 head->r.index++;
809 head->r.step = 1;
810 }
811 break;
812 }
813 if (tomoyo_flush(head))
814 goto next;
815 }
816
817 /**
818 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
819 *
820 * @a: Pointer to "struct tomoyo_acl_head".
821 * @b: Pointer to "struct tomoyo_acl_head".
822 *
823 * Returns true if @a == @b, false otherwise.
824 */
825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
826 const struct tomoyo_acl_head *b)
827 {
828 return container_of(a, struct tomoyo_manager, head)->manager ==
829 container_of(b, struct tomoyo_manager, head)->manager;
830 }
831
832 /**
833 * tomoyo_update_manager_entry - Add a manager entry.
834 *
835 * @manager: The path to manager or the domainnamme.
836 * @is_delete: True if it is a delete request.
837 *
838 * Returns 0 on success, negative value otherwise.
839 *
840 * Caller holds tomoyo_read_lock().
841 */
842 static int tomoyo_update_manager_entry(const char *manager,
843 const bool is_delete)
844 {
845 struct tomoyo_manager e = { };
846 struct tomoyo_acl_param param = {
847 /* .ns = &tomoyo_kernel_namespace, */
848 .is_delete = is_delete,
849 .list = &tomoyo_kernel_namespace.
850 policy_list[TOMOYO_ID_MANAGER],
851 };
852 int error = is_delete ? -ENOENT : -ENOMEM;
853 if (tomoyo_domain_def(manager)) {
854 if (!tomoyo_correct_domain(manager))
855 return -EINVAL;
856 e.is_domain = true;
857 } else {
858 if (!tomoyo_correct_path(manager))
859 return -EINVAL;
860 }
861 e.manager = tomoyo_get_name(manager);
862 if (e.manager) {
863 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
864 tomoyo_same_manager);
865 tomoyo_put_name(e.manager);
866 }
867 return error;
868 }
869
870 /**
871 * tomoyo_write_manager - Write manager policy.
872 *
873 * @head: Pointer to "struct tomoyo_io_buffer".
874 *
875 * Returns 0 on success, negative value otherwise.
876 *
877 * Caller holds tomoyo_read_lock().
878 */
879 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
880 {
881 char *data = head->write_buf;
882
883 if (!strcmp(data, "manage_by_non_root")) {
884 tomoyo_manage_by_non_root = !head->w.is_delete;
885 return 0;
886 }
887 return tomoyo_update_manager_entry(data, head->w.is_delete);
888 }
889
890 /**
891 * tomoyo_read_manager - Read manager policy.
892 *
893 * @head: Pointer to "struct tomoyo_io_buffer".
894 *
895 * Caller holds tomoyo_read_lock().
896 */
897 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
898 {
899 if (head->r.eof)
900 return;
901 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
902 policy_list[TOMOYO_ID_MANAGER]) {
903 struct tomoyo_manager *ptr =
904 list_entry(head->r.acl, typeof(*ptr), head.list);
905 if (ptr->head.is_deleted)
906 continue;
907 if (!tomoyo_flush(head))
908 return;
909 tomoyo_set_string(head, ptr->manager->name);
910 tomoyo_set_lf(head);
911 }
912 head->r.eof = true;
913 }
914
915 /**
916 * tomoyo_manager - Check whether the current process is a policy manager.
917 *
918 * Returns true if the current process is permitted to modify policy
919 * via /sys/kernel/security/tomoyo/ interface.
920 *
921 * Caller holds tomoyo_read_lock().
922 */
923 static bool tomoyo_manager(void)
924 {
925 struct tomoyo_manager *ptr;
926 const char *exe;
927 const struct task_struct *task = current;
928 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
929 bool found = false;
930
931 if (!tomoyo_policy_loaded)
932 return true;
933 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
934 return false;
935 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
936 policy_list[TOMOYO_ID_MANAGER], head.list) {
937 if (!ptr->head.is_deleted && ptr->is_domain
938 && !tomoyo_pathcmp(domainname, ptr->manager)) {
939 found = true;
940 break;
941 }
942 }
943 if (found)
944 return true;
945 exe = tomoyo_get_exe();
946 if (!exe)
947 return false;
948 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
949 policy_list[TOMOYO_ID_MANAGER], head.list) {
950 if (!ptr->head.is_deleted && !ptr->is_domain
951 && !strcmp(exe, ptr->manager->name)) {
952 found = true;
953 break;
954 }
955 }
956 if (!found) { /* Reduce error messages. */
957 static pid_t last_pid;
958 const pid_t pid = current->pid;
959 if (last_pid != pid) {
960 printk(KERN_WARNING "%s ( %s ) is not permitted to "
961 "update policies.\n", domainname->name, exe);
962 last_pid = pid;
963 }
964 }
965 kfree(exe);
966 return found;
967 }
968
969 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
970 (unsigned int serial);
971
972 /**
973 * tomoyo_select_domain - Parse select command.
974 *
975 * @head: Pointer to "struct tomoyo_io_buffer".
976 * @data: String to parse.
977 *
978 * Returns true on success, false otherwise.
979 *
980 * Caller holds tomoyo_read_lock().
981 */
982 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
983 const char *data)
984 {
985 unsigned int pid;
986 struct tomoyo_domain_info *domain = NULL;
987 bool global_pid = false;
988 if (strncmp(data, "select ", 7))
989 return false;
990 data += 7;
991 if (sscanf(data, "pid=%u", &pid) == 1 ||
992 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
993 struct task_struct *p;
994 rcu_read_lock();
995 if (global_pid)
996 p = find_task_by_pid_ns(pid, &init_pid_ns);
997 else
998 p = find_task_by_vpid(pid);
999 if (p)
1000 domain = tomoyo_real_domain(p);
1001 rcu_read_unlock();
1002 } else if (!strncmp(data, "domain=", 7)) {
1003 if (tomoyo_domain_def(data + 7))
1004 domain = tomoyo_find_domain(data + 7);
1005 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1006 domain = tomoyo_find_domain_by_qid(pid);
1007 } else
1008 return false;
1009 head->w.domain = domain;
1010 /* Accessing read_buf is safe because head->io_sem is held. */
1011 if (!head->read_buf)
1012 return true; /* Do nothing if open(O_WRONLY). */
1013 memset(&head->r, 0, sizeof(head->r));
1014 head->r.print_this_domain_only = true;
1015 if (domain)
1016 head->r.domain = &domain->list;
1017 else
1018 head->r.eof = 1;
1019 tomoyo_io_printf(head, "# select %s\n", data);
1020 if (domain && domain->is_deleted)
1021 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1022 return true;
1023 }
1024
1025 /**
1026 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1027 *
1028 * @a: Pointer to "struct tomoyo_acl_info".
1029 * @b: Pointer to "struct tomoyo_acl_info".
1030 *
1031 * Returns true if @a == @b, false otherwise.
1032 */
1033 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1034 const struct tomoyo_acl_info *b)
1035 {
1036 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1037 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1038 return p1->domainname == p2->domainname;
1039 }
1040
1041 /**
1042 * tomoyo_write_task - Update task related list.
1043 *
1044 * @param: Pointer to "struct tomoyo_acl_param".
1045 *
1046 * Returns 0 on success, negative value otherwise.
1047 *
1048 * Caller holds tomoyo_read_lock().
1049 */
1050 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1051 {
1052 int error = -EINVAL;
1053 if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1054 struct tomoyo_task_acl e = {
1055 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1056 .domainname = tomoyo_get_domainname(param),
1057 };
1058 if (e.domainname)
1059 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1060 tomoyo_same_task_acl,
1061 NULL);
1062 tomoyo_put_name(e.domainname);
1063 }
1064 return error;
1065 }
1066
1067 /**
1068 * tomoyo_delete_domain - Delete a domain.
1069 *
1070 * @domainname: The name of domain.
1071 *
1072 * Returns 0.
1073 *
1074 * Caller holds tomoyo_read_lock().
1075 */
1076 static int tomoyo_delete_domain(char *domainname)
1077 {
1078 struct tomoyo_domain_info *domain;
1079 struct tomoyo_path_info name;
1080
1081 name.name = domainname;
1082 tomoyo_fill_path_info(&name);
1083 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1084 return 0;
1085 /* Is there an active domain? */
1086 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1087 /* Never delete tomoyo_kernel_domain */
1088 if (domain == &tomoyo_kernel_domain)
1089 continue;
1090 if (domain->is_deleted ||
1091 tomoyo_pathcmp(domain->domainname, &name))
1092 continue;
1093 domain->is_deleted = true;
1094 break;
1095 }
1096 mutex_unlock(&tomoyo_policy_lock);
1097 return 0;
1098 }
1099
1100 /**
1101 * tomoyo_write_domain2 - Write domain policy.
1102 *
1103 * @ns: Pointer to "struct tomoyo_policy_namespace".
1104 * @list: Pointer to "struct list_head".
1105 * @data: Policy to be interpreted.
1106 * @is_delete: True if it is a delete request.
1107 *
1108 * Returns 0 on success, negative value otherwise.
1109 *
1110 * Caller holds tomoyo_read_lock().
1111 */
1112 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1113 struct list_head *list, char *data,
1114 const bool is_delete)
1115 {
1116 struct tomoyo_acl_param param = {
1117 .ns = ns,
1118 .list = list,
1119 .data = data,
1120 .is_delete = is_delete,
1121 };
1122 static const struct {
1123 const char *keyword;
1124 int (*write) (struct tomoyo_acl_param *);
1125 } tomoyo_callback[5] = {
1126 { "file ", tomoyo_write_file },
1127 { "network inet ", tomoyo_write_inet_network },
1128 { "network unix ", tomoyo_write_unix_network },
1129 { "misc ", tomoyo_write_misc },
1130 { "task ", tomoyo_write_task },
1131 };
1132 u8 i;
1133
1134 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1135 if (!tomoyo_str_starts(&param.data,
1136 tomoyo_callback[i].keyword))
1137 continue;
1138 return tomoyo_callback[i].write(&param);
1139 }
1140 return -EINVAL;
1141 }
1142
1143 /* String table for domain flags. */
1144 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1145 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1146 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1147 };
1148
1149 /**
1150 * tomoyo_write_domain - Write domain policy.
1151 *
1152 * @head: Pointer to "struct tomoyo_io_buffer".
1153 *
1154 * Returns 0 on success, negative value otherwise.
1155 *
1156 * Caller holds tomoyo_read_lock().
1157 */
1158 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1159 {
1160 char *data = head->write_buf;
1161 struct tomoyo_policy_namespace *ns;
1162 struct tomoyo_domain_info *domain = head->w.domain;
1163 const bool is_delete = head->w.is_delete;
1164 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1165 unsigned int profile;
1166 if (*data == '<') {
1167 domain = NULL;
1168 if (is_delete)
1169 tomoyo_delete_domain(data);
1170 else if (is_select)
1171 domain = tomoyo_find_domain(data);
1172 else
1173 domain = tomoyo_assign_domain(data, false);
1174 head->w.domain = domain;
1175 return 0;
1176 }
1177 if (!domain)
1178 return -EINVAL;
1179 ns = domain->ns;
1180 if (sscanf(data, "use_profile %u", &profile) == 1
1181 && profile < TOMOYO_MAX_PROFILES) {
1182 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1183 domain->profile = (u8) profile;
1184 return 0;
1185 }
1186 if (sscanf(data, "use_group %u\n", &profile) == 1
1187 && profile < TOMOYO_MAX_ACL_GROUPS) {
1188 if (!is_delete)
1189 domain->group = (u8) profile;
1190 return 0;
1191 }
1192 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1193 const char *cp = tomoyo_dif[profile];
1194 if (strncmp(data, cp, strlen(cp) - 1))
1195 continue;
1196 domain->flags[profile] = !is_delete;
1197 return 0;
1198 }
1199 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1200 is_delete);
1201 }
1202
1203 /**
1204 * tomoyo_print_condition - Print condition part.
1205 *
1206 * @head: Pointer to "struct tomoyo_io_buffer".
1207 * @cond: Pointer to "struct tomoyo_condition".
1208 *
1209 * Returns true on success, false otherwise.
1210 */
1211 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1212 const struct tomoyo_condition *cond)
1213 {
1214 switch (head->r.cond_step) {
1215 case 0:
1216 head->r.cond_index = 0;
1217 head->r.cond_step++;
1218 if (cond->transit) {
1219 tomoyo_set_space(head);
1220 tomoyo_set_string(head, cond->transit->name);
1221 }
1222 /* fall through */
1223 case 1:
1224 {
1225 const u16 condc = cond->condc;
1226 const struct tomoyo_condition_element *condp =
1227 (typeof(condp)) (cond + 1);
1228 const struct tomoyo_number_union *numbers_p =
1229 (typeof(numbers_p)) (condp + condc);
1230 const struct tomoyo_name_union *names_p =
1231 (typeof(names_p))
1232 (numbers_p + cond->numbers_count);
1233 const struct tomoyo_argv *argv =
1234 (typeof(argv)) (names_p + cond->names_count);
1235 const struct tomoyo_envp *envp =
1236 (typeof(envp)) (argv + cond->argc);
1237 u16 skip;
1238 for (skip = 0; skip < head->r.cond_index; skip++) {
1239 const u8 left = condp->left;
1240 const u8 right = condp->right;
1241 condp++;
1242 switch (left) {
1243 case TOMOYO_ARGV_ENTRY:
1244 argv++;
1245 continue;
1246 case TOMOYO_ENVP_ENTRY:
1247 envp++;
1248 continue;
1249 case TOMOYO_NUMBER_UNION:
1250 numbers_p++;
1251 break;
1252 }
1253 switch (right) {
1254 case TOMOYO_NAME_UNION:
1255 names_p++;
1256 break;
1257 case TOMOYO_NUMBER_UNION:
1258 numbers_p++;
1259 break;
1260 }
1261 }
1262 while (head->r.cond_index < condc) {
1263 const u8 match = condp->equals;
1264 const u8 left = condp->left;
1265 const u8 right = condp->right;
1266 if (!tomoyo_flush(head))
1267 return false;
1268 condp++;
1269 head->r.cond_index++;
1270 tomoyo_set_space(head);
1271 switch (left) {
1272 case TOMOYO_ARGV_ENTRY:
1273 tomoyo_io_printf(head,
1274 "exec.argv[%lu]%s=\"",
1275 argv->index, argv->
1276 is_not ? "!" : "");
1277 tomoyo_set_string(head,
1278 argv->value->name);
1279 tomoyo_set_string(head, "\"");
1280 argv++;
1281 continue;
1282 case TOMOYO_ENVP_ENTRY:
1283 tomoyo_set_string(head,
1284 "exec.envp[\"");
1285 tomoyo_set_string(head,
1286 envp->name->name);
1287 tomoyo_io_printf(head, "\"]%s=", envp->
1288 is_not ? "!" : "");
1289 if (envp->value) {
1290 tomoyo_set_string(head, "\"");
1291 tomoyo_set_string(head, envp->
1292 value->name);
1293 tomoyo_set_string(head, "\"");
1294 } else {
1295 tomoyo_set_string(head,
1296 "NULL");
1297 }
1298 envp++;
1299 continue;
1300 case TOMOYO_NUMBER_UNION:
1301 tomoyo_print_number_union_nospace
1302 (head, numbers_p++);
1303 break;
1304 default:
1305 tomoyo_set_string(head,
1306 tomoyo_condition_keyword[left]);
1307 break;
1308 }
1309 tomoyo_set_string(head, match ? "=" : "!=");
1310 switch (right) {
1311 case TOMOYO_NAME_UNION:
1312 tomoyo_print_name_union_quoted
1313 (head, names_p++);
1314 break;
1315 case TOMOYO_NUMBER_UNION:
1316 tomoyo_print_number_union_nospace
1317 (head, numbers_p++);
1318 break;
1319 default:
1320 tomoyo_set_string(head,
1321 tomoyo_condition_keyword[right]);
1322 break;
1323 }
1324 }
1325 }
1326 head->r.cond_step++;
1327 /* fall through */
1328 case 2:
1329 if (!tomoyo_flush(head))
1330 break;
1331 head->r.cond_step++;
1332 /* fall through */
1333 case 3:
1334 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1335 tomoyo_io_printf(head, " grant_log=%s",
1336 tomoyo_yesno(cond->grant_log ==
1337 TOMOYO_GRANTLOG_YES));
1338 tomoyo_set_lf(head);
1339 return true;
1340 }
1341 return false;
1342 }
1343
1344 /**
1345 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1346 *
1347 * @head: Pointer to "struct tomoyo_io_buffer".
1348 * @category: Category name.
1349 *
1350 * Returns nothing.
1351 */
1352 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1353 const char *category)
1354 {
1355 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1356 tomoyo_print_namespace(head);
1357 tomoyo_io_printf(head, "acl_group %u ",
1358 head->r.acl_group_index);
1359 }
1360 tomoyo_set_string(head, category);
1361 }
1362
1363 /**
1364 * tomoyo_print_entry - Print an ACL entry.
1365 *
1366 * @head: Pointer to "struct tomoyo_io_buffer".
1367 * @acl: Pointer to an ACL entry.
1368 *
1369 * Returns true on success, false otherwise.
1370 */
1371 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1372 struct tomoyo_acl_info *acl)
1373 {
1374 const u8 acl_type = acl->type;
1375 bool first = true;
1376 u8 bit;
1377
1378 if (head->r.print_cond_part)
1379 goto print_cond_part;
1380 if (acl->is_deleted)
1381 return true;
1382 if (!tomoyo_flush(head))
1383 return false;
1384 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1385 struct tomoyo_path_acl *ptr =
1386 container_of(acl, typeof(*ptr), head);
1387 const u16 perm = ptr->perm;
1388 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1389 if (!(perm & (1 << bit)))
1390 continue;
1391 if (head->r.print_transition_related_only &&
1392 bit != TOMOYO_TYPE_EXECUTE)
1393 continue;
1394 if (first) {
1395 tomoyo_set_group(head, "file ");
1396 first = false;
1397 } else {
1398 tomoyo_set_slash(head);
1399 }
1400 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1401 }
1402 if (first)
1403 return true;
1404 tomoyo_print_name_union(head, &ptr->name);
1405 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1406 struct tomoyo_task_acl *ptr =
1407 container_of(acl, typeof(*ptr), head);
1408 tomoyo_set_group(head, "task ");
1409 tomoyo_set_string(head, "manual_domain_transition ");
1410 tomoyo_set_string(head, ptr->domainname->name);
1411 } else if (head->r.print_transition_related_only) {
1412 return true;
1413 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1414 struct tomoyo_path2_acl *ptr =
1415 container_of(acl, typeof(*ptr), head);
1416 const u8 perm = ptr->perm;
1417 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1418 if (!(perm & (1 << bit)))
1419 continue;
1420 if (first) {
1421 tomoyo_set_group(head, "file ");
1422 first = false;
1423 } else {
1424 tomoyo_set_slash(head);
1425 }
1426 tomoyo_set_string(head, tomoyo_mac_keywords
1427 [tomoyo_pp2mac[bit]]);
1428 }
1429 if (first)
1430 return true;
1431 tomoyo_print_name_union(head, &ptr->name1);
1432 tomoyo_print_name_union(head, &ptr->name2);
1433 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1434 struct tomoyo_path_number_acl *ptr =
1435 container_of(acl, typeof(*ptr), head);
1436 const u8 perm = ptr->perm;
1437 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1438 if (!(perm & (1 << bit)))
1439 continue;
1440 if (first) {
1441 tomoyo_set_group(head, "file ");
1442 first = false;
1443 } else {
1444 tomoyo_set_slash(head);
1445 }
1446 tomoyo_set_string(head, tomoyo_mac_keywords
1447 [tomoyo_pn2mac[bit]]);
1448 }
1449 if (first)
1450 return true;
1451 tomoyo_print_name_union(head, &ptr->name);
1452 tomoyo_print_number_union(head, &ptr->number);
1453 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1454 struct tomoyo_mkdev_acl *ptr =
1455 container_of(acl, typeof(*ptr), head);
1456 const u8 perm = ptr->perm;
1457 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1458 if (!(perm & (1 << bit)))
1459 continue;
1460 if (first) {
1461 tomoyo_set_group(head, "file ");
1462 first = false;
1463 } else {
1464 tomoyo_set_slash(head);
1465 }
1466 tomoyo_set_string(head, tomoyo_mac_keywords
1467 [tomoyo_pnnn2mac[bit]]);
1468 }
1469 if (first)
1470 return true;
1471 tomoyo_print_name_union(head, &ptr->name);
1472 tomoyo_print_number_union(head, &ptr->mode);
1473 tomoyo_print_number_union(head, &ptr->major);
1474 tomoyo_print_number_union(head, &ptr->minor);
1475 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1476 struct tomoyo_inet_acl *ptr =
1477 container_of(acl, typeof(*ptr), head);
1478 const u8 perm = ptr->perm;
1479
1480 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1481 if (!(perm & (1 << bit)))
1482 continue;
1483 if (first) {
1484 tomoyo_set_group(head, "network inet ");
1485 tomoyo_set_string(head, tomoyo_proto_keyword
1486 [ptr->protocol]);
1487 tomoyo_set_space(head);
1488 first = false;
1489 } else {
1490 tomoyo_set_slash(head);
1491 }
1492 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1493 }
1494 if (first)
1495 return true;
1496 tomoyo_set_space(head);
1497 if (ptr->address.group) {
1498 tomoyo_set_string(head, "@");
1499 tomoyo_set_string(head, ptr->address.group->group_name
1500 ->name);
1501 } else {
1502 char buf[128];
1503 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1504 tomoyo_io_printf(head, "%s", buf);
1505 }
1506 tomoyo_print_number_union(head, &ptr->port);
1507 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1508 struct tomoyo_unix_acl *ptr =
1509 container_of(acl, typeof(*ptr), head);
1510 const u8 perm = ptr->perm;
1511
1512 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1513 if (!(perm & (1 << bit)))
1514 continue;
1515 if (first) {
1516 tomoyo_set_group(head, "network unix ");
1517 tomoyo_set_string(head, tomoyo_proto_keyword
1518 [ptr->protocol]);
1519 tomoyo_set_space(head);
1520 first = false;
1521 } else {
1522 tomoyo_set_slash(head);
1523 }
1524 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1525 }
1526 if (first)
1527 return true;
1528 tomoyo_print_name_union(head, &ptr->name);
1529 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1530 struct tomoyo_mount_acl *ptr =
1531 container_of(acl, typeof(*ptr), head);
1532 tomoyo_set_group(head, "file mount");
1533 tomoyo_print_name_union(head, &ptr->dev_name);
1534 tomoyo_print_name_union(head, &ptr->dir_name);
1535 tomoyo_print_name_union(head, &ptr->fs_type);
1536 tomoyo_print_number_union(head, &ptr->flags);
1537 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1538 struct tomoyo_env_acl *ptr =
1539 container_of(acl, typeof(*ptr), head);
1540
1541 tomoyo_set_group(head, "misc env ");
1542 tomoyo_set_string(head, ptr->env->name);
1543 }
1544 if (acl->cond) {
1545 head->r.print_cond_part = true;
1546 head->r.cond_step = 0;
1547 if (!tomoyo_flush(head))
1548 return false;
1549 print_cond_part:
1550 if (!tomoyo_print_condition(head, acl->cond))
1551 return false;
1552 head->r.print_cond_part = false;
1553 } else {
1554 tomoyo_set_lf(head);
1555 }
1556 return true;
1557 }
1558
1559 /**
1560 * tomoyo_read_domain2 - Read domain policy.
1561 *
1562 * @head: Pointer to "struct tomoyo_io_buffer".
1563 * @list: Pointer to "struct list_head".
1564 *
1565 * Caller holds tomoyo_read_lock().
1566 *
1567 * Returns true on success, false otherwise.
1568 */
1569 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1570 struct list_head *list)
1571 {
1572 list_for_each_cookie(head->r.acl, list) {
1573 struct tomoyo_acl_info *ptr =
1574 list_entry(head->r.acl, typeof(*ptr), list);
1575 if (!tomoyo_print_entry(head, ptr))
1576 return false;
1577 }
1578 head->r.acl = NULL;
1579 return true;
1580 }
1581
1582 /**
1583 * tomoyo_read_domain - Read domain policy.
1584 *
1585 * @head: Pointer to "struct tomoyo_io_buffer".
1586 *
1587 * Caller holds tomoyo_read_lock().
1588 */
1589 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1590 {
1591 if (head->r.eof)
1592 return;
1593 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1594 struct tomoyo_domain_info *domain =
1595 list_entry(head->r.domain, typeof(*domain), list);
1596 switch (head->r.step) {
1597 u8 i;
1598 case 0:
1599 if (domain->is_deleted &&
1600 !head->r.print_this_domain_only)
1601 continue;
1602 /* Print domainname and flags. */
1603 tomoyo_set_string(head, domain->domainname->name);
1604 tomoyo_set_lf(head);
1605 tomoyo_io_printf(head, "use_profile %u\n",
1606 domain->profile);
1607 tomoyo_io_printf(head, "use_group %u\n",
1608 domain->group);
1609 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1610 if (domain->flags[i])
1611 tomoyo_set_string(head, tomoyo_dif[i]);
1612 head->r.step++;
1613 tomoyo_set_lf(head);
1614 /* fall through */
1615 case 1:
1616 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1617 return;
1618 head->r.step++;
1619 if (!tomoyo_set_lf(head))
1620 return;
1621 /* fall through */
1622 case 2:
1623 head->r.step = 0;
1624 if (head->r.print_this_domain_only)
1625 goto done;
1626 }
1627 }
1628 done:
1629 head->r.eof = true;
1630 }
1631
1632 /**
1633 * tomoyo_write_pid: Specify PID to obtain domainname.
1634 *
1635 * @head: Pointer to "struct tomoyo_io_buffer".
1636 *
1637 * Returns 0.
1638 */
1639 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1640 {
1641 head->r.eof = false;
1642 return 0;
1643 }
1644
1645 /**
1646 * tomoyo_read_pid - Get domainname of the specified PID.
1647 *
1648 * @head: Pointer to "struct tomoyo_io_buffer".
1649 *
1650 * Returns the domainname which the specified PID is in on success,
1651 * empty string otherwise.
1652 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1653 * using read()/write() interface rather than sysctl() interface.
1654 */
1655 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1656 {
1657 char *buf = head->write_buf;
1658 bool global_pid = false;
1659 unsigned int pid;
1660 struct task_struct *p;
1661 struct tomoyo_domain_info *domain = NULL;
1662
1663 /* Accessing write_buf is safe because head->io_sem is held. */
1664 if (!buf) {
1665 head->r.eof = true;
1666 return; /* Do nothing if open(O_RDONLY). */
1667 }
1668 if (head->r.w_pos || head->r.eof)
1669 return;
1670 head->r.eof = true;
1671 if (tomoyo_str_starts(&buf, "global-pid "))
1672 global_pid = true;
1673 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1674 rcu_read_lock();
1675 if (global_pid)
1676 p = find_task_by_pid_ns(pid, &init_pid_ns);
1677 else
1678 p = find_task_by_vpid(pid);
1679 if (p)
1680 domain = tomoyo_real_domain(p);
1681 rcu_read_unlock();
1682 if (!domain)
1683 return;
1684 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1685 tomoyo_set_string(head, domain->domainname->name);
1686 }
1687
1688 /* String table for domain transition control keywords. */
1689 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1690 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1691 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1692 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1693 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1694 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1695 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1696 };
1697
1698 /* String table for grouping keywords. */
1699 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1700 [TOMOYO_PATH_GROUP] = "path_group ",
1701 [TOMOYO_NUMBER_GROUP] = "number_group ",
1702 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1703 };
1704
1705 /**
1706 * tomoyo_write_exception - Write exception policy.
1707 *
1708 * @head: Pointer to "struct tomoyo_io_buffer".
1709 *
1710 * Returns 0 on success, negative value otherwise.
1711 *
1712 * Caller holds tomoyo_read_lock().
1713 */
1714 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1715 {
1716 const bool is_delete = head->w.is_delete;
1717 struct tomoyo_acl_param param = {
1718 .ns = head->w.ns,
1719 .is_delete = is_delete,
1720 .data = head->write_buf,
1721 };
1722 u8 i;
1723 if (tomoyo_str_starts(&param.data, "aggregator "))
1724 return tomoyo_write_aggregator(&param);
1725 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1726 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1727 return tomoyo_write_transition_control(&param, i);
1728 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1729 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1730 return tomoyo_write_group(&param, i);
1731 if (tomoyo_str_starts(&param.data, "acl_group ")) {
1732 unsigned int group;
1733 char *data;
1734 group = simple_strtoul(param.data, &data, 10);
1735 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1736 return tomoyo_write_domain2
1737 (head->w.ns, &head->w.ns->acl_group[group],
1738 data, is_delete);
1739 }
1740 return -EINVAL;
1741 }
1742
1743 /**
1744 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1745 *
1746 * @head: Pointer to "struct tomoyo_io_buffer".
1747 * @idx: Index number.
1748 *
1749 * Returns true on success, false otherwise.
1750 *
1751 * Caller holds tomoyo_read_lock().
1752 */
1753 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1754 {
1755 struct tomoyo_policy_namespace *ns =
1756 container_of(head->r.ns, typeof(*ns), namespace_list);
1757 struct list_head *list = &ns->group_list[idx];
1758 list_for_each_cookie(head->r.group, list) {
1759 struct tomoyo_group *group =
1760 list_entry(head->r.group, typeof(*group), head.list);
1761 list_for_each_cookie(head->r.acl, &group->member_list) {
1762 struct tomoyo_acl_head *ptr =
1763 list_entry(head->r.acl, typeof(*ptr), list);
1764 if (ptr->is_deleted)
1765 continue;
1766 if (!tomoyo_flush(head))
1767 return false;
1768 tomoyo_print_namespace(head);
1769 tomoyo_set_string(head, tomoyo_group_name[idx]);
1770 tomoyo_set_string(head, group->group_name->name);
1771 if (idx == TOMOYO_PATH_GROUP) {
1772 tomoyo_set_space(head);
1773 tomoyo_set_string(head, container_of
1774 (ptr, struct tomoyo_path_group,
1775 head)->member_name->name);
1776 } else if (idx == TOMOYO_NUMBER_GROUP) {
1777 tomoyo_print_number_union(head, &container_of
1778 (ptr,
1779 struct tomoyo_number_group,
1780 head)->number);
1781 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1782 char buffer[128];
1783
1784 struct tomoyo_address_group *member =
1785 container_of(ptr, typeof(*member),
1786 head);
1787 tomoyo_print_ip(buffer, sizeof(buffer),
1788 &member->address);
1789 tomoyo_io_printf(head, " %s", buffer);
1790 }
1791 tomoyo_set_lf(head);
1792 }
1793 head->r.acl = NULL;
1794 }
1795 head->r.group = NULL;
1796 return true;
1797 }
1798
1799 /**
1800 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1801 *
1802 * @head: Pointer to "struct tomoyo_io_buffer".
1803 * @idx: Index number.
1804 *
1805 * Returns true on success, false otherwise.
1806 *
1807 * Caller holds tomoyo_read_lock().
1808 */
1809 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1810 {
1811 struct tomoyo_policy_namespace *ns =
1812 container_of(head->r.ns, typeof(*ns), namespace_list);
1813 struct list_head *list = &ns->policy_list[idx];
1814 list_for_each_cookie(head->r.acl, list) {
1815 struct tomoyo_acl_head *acl =
1816 container_of(head->r.acl, typeof(*acl), list);
1817 if (acl->is_deleted)
1818 continue;
1819 if (!tomoyo_flush(head))
1820 return false;
1821 switch (idx) {
1822 case TOMOYO_ID_TRANSITION_CONTROL:
1823 {
1824 struct tomoyo_transition_control *ptr =
1825 container_of(acl, typeof(*ptr), head);
1826 tomoyo_print_namespace(head);
1827 tomoyo_set_string(head, tomoyo_transition_type
1828 [ptr->type]);
1829 tomoyo_set_string(head, ptr->program ?
1830 ptr->program->name : "any");
1831 tomoyo_set_string(head, " from ");
1832 tomoyo_set_string(head, ptr->domainname ?
1833 ptr->domainname->name :
1834 "any");
1835 }
1836 break;
1837 case TOMOYO_ID_AGGREGATOR:
1838 {
1839 struct tomoyo_aggregator *ptr =
1840 container_of(acl, typeof(*ptr), head);
1841 tomoyo_print_namespace(head);
1842 tomoyo_set_string(head, "aggregator ");
1843 tomoyo_set_string(head,
1844 ptr->original_name->name);
1845 tomoyo_set_space(head);
1846 tomoyo_set_string(head,
1847 ptr->aggregated_name->name);
1848 }
1849 break;
1850 default:
1851 continue;
1852 }
1853 tomoyo_set_lf(head);
1854 }
1855 head->r.acl = NULL;
1856 return true;
1857 }
1858
1859 /**
1860 * tomoyo_read_exception - Read exception policy.
1861 *
1862 * @head: Pointer to "struct tomoyo_io_buffer".
1863 *
1864 * Caller holds tomoyo_read_lock().
1865 */
1866 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1867 {
1868 struct tomoyo_policy_namespace *ns =
1869 container_of(head->r.ns, typeof(*ns), namespace_list);
1870 if (head->r.eof)
1871 return;
1872 while (head->r.step < TOMOYO_MAX_POLICY &&
1873 tomoyo_read_policy(head, head->r.step))
1874 head->r.step++;
1875 if (head->r.step < TOMOYO_MAX_POLICY)
1876 return;
1877 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1878 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1879 head->r.step++;
1880 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1881 return;
1882 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1883 + TOMOYO_MAX_ACL_GROUPS) {
1884 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1885 - TOMOYO_MAX_GROUP;
1886 if (!tomoyo_read_domain2(head, &ns->acl_group
1887 [head->r.acl_group_index]))
1888 return;
1889 head->r.step++;
1890 }
1891 head->r.eof = true;
1892 }
1893
1894 /* Wait queue for kernel -> userspace notification. */
1895 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1896 /* Wait queue for userspace -> kernel notification. */
1897 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1898
1899 /* Structure for query. */
1900 struct tomoyo_query {
1901 struct list_head list;
1902 struct tomoyo_domain_info *domain;
1903 char *query;
1904 size_t query_len;
1905 unsigned int serial;
1906 u8 timer;
1907 u8 answer;
1908 u8 retry;
1909 };
1910
1911 /* The list for "struct tomoyo_query". */
1912 static LIST_HEAD(tomoyo_query_list);
1913
1914 /* Lock for manipulating tomoyo_query_list. */
1915 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1916
1917 /*
1918 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1919 * interface.
1920 */
1921 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1922
1923 /**
1924 * tomoyo_truncate - Truncate a line.
1925 *
1926 * @str: String to truncate.
1927 *
1928 * Returns length of truncated @str.
1929 */
1930 static int tomoyo_truncate(char *str)
1931 {
1932 char *start = str;
1933 while (*(unsigned char *) str > (unsigned char) ' ')
1934 str++;
1935 *str = '\0';
1936 return strlen(start) + 1;
1937 }
1938
1939 /**
1940 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1941 *
1942 * @domain: Pointer to "struct tomoyo_domain_info".
1943 * @header: Lines containing ACL.
1944 *
1945 * Returns nothing.
1946 */
1947 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1948 {
1949 char *buffer;
1950 char *realpath = NULL;
1951 char *argv0 = NULL;
1952 char *symlink = NULL;
1953 char *cp = strchr(header, '\n');
1954 int len;
1955 if (!cp)
1956 return;
1957 cp = strchr(cp + 1, '\n');
1958 if (!cp)
1959 return;
1960 *cp++ = '\0';
1961 len = strlen(cp) + 1;
1962 /* strstr() will return NULL if ordering is wrong. */
1963 if (*cp == 'f') {
1964 argv0 = strstr(header, " argv[]={ \"");
1965 if (argv0) {
1966 argv0 += 10;
1967 len += tomoyo_truncate(argv0) + 14;
1968 }
1969 realpath = strstr(header, " exec={ realpath=\"");
1970 if (realpath) {
1971 realpath += 8;
1972 len += tomoyo_truncate(realpath) + 6;
1973 }
1974 symlink = strstr(header, " symlink.target=\"");
1975 if (symlink)
1976 len += tomoyo_truncate(symlink + 1) + 1;
1977 }
1978 buffer = kmalloc(len, GFP_NOFS);
1979 if (!buffer)
1980 return;
1981 snprintf(buffer, len - 1, "%s", cp);
1982 if (realpath)
1983 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1984 if (argv0)
1985 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1986 if (symlink)
1987 tomoyo_addprintf(buffer, len, "%s", symlink);
1988 tomoyo_normalize_line(buffer);
1989 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1990 false))
1991 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1992 kfree(buffer);
1993 }
1994
1995 /**
1996 * tomoyo_supervisor - Ask for the supervisor's decision.
1997 *
1998 * @r: Pointer to "struct tomoyo_request_info".
1999 * @fmt: The printf()'s format string, followed by parameters.
2000 *
2001 * Returns 0 if the supervisor decided to permit the access request which
2002 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2003 * supervisor decided to retry the access request which violated the policy in
2004 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2005 */
2006 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2007 {
2008 va_list args;
2009 int error;
2010 int len;
2011 static unsigned int tomoyo_serial;
2012 struct tomoyo_query entry = { };
2013 bool quota_exceeded = false;
2014 va_start(args, fmt);
2015 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2016 va_end(args);
2017 /* Write /sys/kernel/security/tomoyo/audit. */
2018 va_start(args, fmt);
2019 tomoyo_write_log2(r, len, fmt, args);
2020 va_end(args);
2021 /* Nothing more to do if granted. */
2022 if (r->granted)
2023 return 0;
2024 if (r->mode)
2025 tomoyo_update_stat(r->mode);
2026 switch (r->mode) {
2027 case TOMOYO_CONFIG_ENFORCING:
2028 error = -EPERM;
2029 if (atomic_read(&tomoyo_query_observers))
2030 break;
2031 goto out;
2032 case TOMOYO_CONFIG_LEARNING:
2033 error = 0;
2034 /* Check max_learning_entry parameter. */
2035 if (tomoyo_domain_quota_is_ok(r))
2036 break;
2037 /* fall through */
2038 default:
2039 return 0;
2040 }
2041 /* Get message. */
2042 va_start(args, fmt);
2043 entry.query = tomoyo_init_log(r, len, fmt, args);
2044 va_end(args);
2045 if (!entry.query)
2046 goto out;
2047 entry.query_len = strlen(entry.query) + 1;
2048 if (!error) {
2049 tomoyo_add_entry(r->domain, entry.query);
2050 goto out;
2051 }
2052 len = tomoyo_round2(entry.query_len);
2053 entry.domain = r->domain;
2054 spin_lock(&tomoyo_query_list_lock);
2055 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2056 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2057 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2058 quota_exceeded = true;
2059 } else {
2060 entry.serial = tomoyo_serial++;
2061 entry.retry = r->retry;
2062 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2063 list_add_tail(&entry.list, &tomoyo_query_list);
2064 }
2065 spin_unlock(&tomoyo_query_list_lock);
2066 if (quota_exceeded)
2067 goto out;
2068 /* Give 10 seconds for supervisor's opinion. */
2069 while (entry.timer < 10) {
2070 wake_up_all(&tomoyo_query_wait);
2071 if (wait_event_interruptible_timeout
2072 (tomoyo_answer_wait, entry.answer ||
2073 !atomic_read(&tomoyo_query_observers), HZ))
2074 break;
2075 else
2076 entry.timer++;
2077 }
2078 spin_lock(&tomoyo_query_list_lock);
2079 list_del(&entry.list);
2080 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2081 spin_unlock(&tomoyo_query_list_lock);
2082 switch (entry.answer) {
2083 case 3: /* Asked to retry by administrator. */
2084 error = TOMOYO_RETRY_REQUEST;
2085 r->retry++;
2086 break;
2087 case 1:
2088 /* Granted by administrator. */
2089 error = 0;
2090 break;
2091 default:
2092 /* Timed out or rejected by administrator. */
2093 break;
2094 }
2095 out:
2096 kfree(entry.query);
2097 return error;
2098 }
2099
2100 /**
2101 * tomoyo_find_domain_by_qid - Get domain by query id.
2102 *
2103 * @serial: Query ID assigned by tomoyo_supervisor().
2104 *
2105 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2106 */
2107 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2108 (unsigned int serial)
2109 {
2110 struct tomoyo_query *ptr;
2111 struct tomoyo_domain_info *domain = NULL;
2112 spin_lock(&tomoyo_query_list_lock);
2113 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2114 if (ptr->serial != serial || ptr->answer)
2115 continue;
2116 domain = ptr->domain;
2117 break;
2118 }
2119 spin_unlock(&tomoyo_query_list_lock);
2120 return domain;
2121 }
2122
2123 /**
2124 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2125 *
2126 * @file: Pointer to "struct file".
2127 * @wait: Pointer to "poll_table".
2128 *
2129 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2130 *
2131 * Waits for access requests which violated policy in enforcing mode.
2132 */
2133 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2134 {
2135 struct list_head *tmp;
2136 bool found = false;
2137 u8 i;
2138 for (i = 0; i < 2; i++) {
2139 spin_lock(&tomoyo_query_list_lock);
2140 list_for_each(tmp, &tomoyo_query_list) {
2141 struct tomoyo_query *ptr =
2142 list_entry(tmp, typeof(*ptr), list);
2143 if (ptr->answer)
2144 continue;
2145 found = true;
2146 break;
2147 }
2148 spin_unlock(&tomoyo_query_list_lock);
2149 if (found)
2150 return POLLIN | POLLRDNORM;
2151 if (i)
2152 break;
2153 poll_wait(file, &tomoyo_query_wait, wait);
2154 }
2155 return 0;
2156 }
2157
2158 /**
2159 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2160 *
2161 * @head: Pointer to "struct tomoyo_io_buffer".
2162 */
2163 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2164 {
2165 struct list_head *tmp;
2166 unsigned int pos = 0;
2167 size_t len = 0;
2168 char *buf;
2169 if (head->r.w_pos)
2170 return;
2171 if (head->read_buf) {
2172 kfree(head->read_buf);
2173 head->read_buf = NULL;
2174 }
2175 spin_lock(&tomoyo_query_list_lock);
2176 list_for_each(tmp, &tomoyo_query_list) {
2177 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2178 if (ptr->answer)
2179 continue;
2180 if (pos++ != head->r.query_index)
2181 continue;
2182 len = ptr->query_len;
2183 break;
2184 }
2185 spin_unlock(&tomoyo_query_list_lock);
2186 if (!len) {
2187 head->r.query_index = 0;
2188 return;
2189 }
2190 buf = kzalloc(len + 32, GFP_NOFS);
2191 if (!buf)
2192 return;
2193 pos = 0;
2194 spin_lock(&tomoyo_query_list_lock);
2195 list_for_each(tmp, &tomoyo_query_list) {
2196 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2197 if (ptr->answer)
2198 continue;
2199 if (pos++ != head->r.query_index)
2200 continue;
2201 /*
2202 * Some query can be skipped because tomoyo_query_list
2203 * can change, but I don't care.
2204 */
2205 if (len == ptr->query_len)
2206 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2207 ptr->retry, ptr->query);
2208 break;
2209 }
2210 spin_unlock(&tomoyo_query_list_lock);
2211 if (buf[0]) {
2212 head->read_buf = buf;
2213 head->r.w[head->r.w_pos++] = buf;
2214 head->r.query_index++;
2215 } else {
2216 kfree(buf);
2217 }
2218 }
2219
2220 /**
2221 * tomoyo_write_answer - Write the supervisor's decision.
2222 *
2223 * @head: Pointer to "struct tomoyo_io_buffer".
2224 *
2225 * Returns 0 on success, -EINVAL otherwise.
2226 */
2227 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2228 {
2229 char *data = head->write_buf;
2230 struct list_head *tmp;
2231 unsigned int serial;
2232 unsigned int answer;
2233 spin_lock(&tomoyo_query_list_lock);
2234 list_for_each(tmp, &tomoyo_query_list) {
2235 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2236 ptr->timer = 0;
2237 }
2238 spin_unlock(&tomoyo_query_list_lock);
2239 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2240 return -EINVAL;
2241 spin_lock(&tomoyo_query_list_lock);
2242 list_for_each(tmp, &tomoyo_query_list) {
2243 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2244 if (ptr->serial != serial)
2245 continue;
2246 if (!ptr->answer)
2247 ptr->answer = answer;
2248 break;
2249 }
2250 spin_unlock(&tomoyo_query_list_lock);
2251 return 0;
2252 }
2253
2254 /**
2255 * tomoyo_read_version: Get version.
2256 *
2257 * @head: Pointer to "struct tomoyo_io_buffer".
2258 *
2259 * Returns version information.
2260 */
2261 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2262 {
2263 if (!head->r.eof) {
2264 tomoyo_io_printf(head, "2.5.0");
2265 head->r.eof = true;
2266 }
2267 }
2268
2269 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2270 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2271 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2272 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2273 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2274 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2275 };
2276
2277 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2278 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2279 [TOMOYO_MEMORY_POLICY] = "policy:",
2280 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2281 [TOMOYO_MEMORY_QUERY] = "query message:",
2282 };
2283
2284 /* Timestamp counter for last updated. */
2285 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2286 /* Counter for number of updates. */
2287 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2288
2289 /**
2290 * tomoyo_update_stat - Update statistic counters.
2291 *
2292 * @index: Index for policy type.
2293 *
2294 * Returns nothing.
2295 */
2296 void tomoyo_update_stat(const u8 index)
2297 {
2298 struct timeval tv;
2299 do_gettimeofday(&tv);
2300 /*
2301 * I don't use atomic operations because race condition is not fatal.
2302 */
2303 tomoyo_stat_updated[index]++;
2304 tomoyo_stat_modified[index] = tv.tv_sec;
2305 }
2306
2307 /**
2308 * tomoyo_read_stat - Read statistic data.
2309 *
2310 * @head: Pointer to "struct tomoyo_io_buffer".
2311 *
2312 * Returns nothing.
2313 */
2314 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2315 {
2316 u8 i;
2317 unsigned int total = 0;
2318 if (head->r.eof)
2319 return;
2320 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2321 tomoyo_io_printf(head, "Policy %-30s %10u",
2322 tomoyo_policy_headers[i],
2323 tomoyo_stat_updated[i]);
2324 if (tomoyo_stat_modified[i]) {
2325 struct tomoyo_time stamp;
2326 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2327 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2328 "%02u:%02u:%02u)",
2329 stamp.year, stamp.month, stamp.day,
2330 stamp.hour, stamp.min, stamp.sec);
2331 }
2332 tomoyo_set_lf(head);
2333 }
2334 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2335 unsigned int used = tomoyo_memory_used[i];
2336 total += used;
2337 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2338 tomoyo_memory_headers[i], used);
2339 used = tomoyo_memory_quota[i];
2340 if (used)
2341 tomoyo_io_printf(head, " (Quota: %10u)", used);
2342 tomoyo_set_lf(head);
2343 }
2344 tomoyo_io_printf(head, "Total memory used: %10u\n",
2345 total);
2346 head->r.eof = true;
2347 }
2348
2349 /**
2350 * tomoyo_write_stat - Set memory quota.
2351 *
2352 * @head: Pointer to "struct tomoyo_io_buffer".
2353 *
2354 * Returns 0.
2355 */
2356 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2357 {
2358 char *data = head->write_buf;
2359 u8 i;
2360 if (tomoyo_str_starts(&data, "Memory used by "))
2361 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2362 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2363 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2364 return 0;
2365 }
2366
2367 /**
2368 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2369 *
2370 * @type: Type of interface.
2371 * @file: Pointer to "struct file".
2372 *
2373 * Returns 0 on success, negative value otherwise.
2374 */
2375 int tomoyo_open_control(const u8 type, struct file *file)
2376 {
2377 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2378
2379 if (!head)
2380 return -ENOMEM;
2381 mutex_init(&head->io_sem);
2382 head->type = type;
2383 switch (type) {
2384 case TOMOYO_DOMAINPOLICY:
2385 /* /sys/kernel/security/tomoyo/domain_policy */
2386 head->write = tomoyo_write_domain;
2387 head->read = tomoyo_read_domain;
2388 break;
2389 case TOMOYO_EXCEPTIONPOLICY:
2390 /* /sys/kernel/security/tomoyo/exception_policy */
2391 head->write = tomoyo_write_exception;
2392 head->read = tomoyo_read_exception;
2393 break;
2394 case TOMOYO_AUDIT:
2395 /* /sys/kernel/security/tomoyo/audit */
2396 head->poll = tomoyo_poll_log;
2397 head->read = tomoyo_read_log;
2398 break;
2399 case TOMOYO_PROCESS_STATUS:
2400 /* /sys/kernel/security/tomoyo/.process_status */
2401 head->write = tomoyo_write_pid;
2402 head->read = tomoyo_read_pid;
2403 break;
2404 case TOMOYO_VERSION:
2405 /* /sys/kernel/security/tomoyo/version */
2406 head->read = tomoyo_read_version;
2407 head->readbuf_size = 128;
2408 break;
2409 case TOMOYO_STAT:
2410 /* /sys/kernel/security/tomoyo/stat */
2411 head->write = tomoyo_write_stat;
2412 head->read = tomoyo_read_stat;
2413 head->readbuf_size = 1024;
2414 break;
2415 case TOMOYO_PROFILE:
2416 /* /sys/kernel/security/tomoyo/profile */
2417 head->write = tomoyo_write_profile;
2418 head->read = tomoyo_read_profile;
2419 break;
2420 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2421 head->poll = tomoyo_poll_query;
2422 head->write = tomoyo_write_answer;
2423 head->read = tomoyo_read_query;
2424 break;
2425 case TOMOYO_MANAGER:
2426 /* /sys/kernel/security/tomoyo/manager */
2427 head->write = tomoyo_write_manager;
2428 head->read = tomoyo_read_manager;
2429 break;
2430 }
2431 if (!(file->f_mode & FMODE_READ)) {
2432 /*
2433 * No need to allocate read_buf since it is not opened
2434 * for reading.
2435 */
2436 head->read = NULL;
2437 head->poll = NULL;
2438 } else if (!head->poll) {
2439 /* Don't allocate read_buf for poll() access. */
2440 if (!head->readbuf_size)
2441 head->readbuf_size = 4096 * 2;
2442 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2443 if (!head->read_buf) {
2444 kfree(head);
2445 return -ENOMEM;
2446 }
2447 }
2448 if (!(file->f_mode & FMODE_WRITE)) {
2449 /*
2450 * No need to allocate write_buf since it is not opened
2451 * for writing.
2452 */
2453 head->write = NULL;
2454 } else if (head->write) {
2455 head->writebuf_size = 4096 * 2;
2456 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2457 if (!head->write_buf) {
2458 kfree(head->read_buf);
2459 kfree(head);
2460 return -ENOMEM;
2461 }
2462 }
2463 /*
2464 * If the file is /sys/kernel/security/tomoyo/query , increment the
2465 * observer counter.
2466 * The obserber counter is used by tomoyo_supervisor() to see if
2467 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2468 */
2469 if (type == TOMOYO_QUERY)
2470 atomic_inc(&tomoyo_query_observers);
2471 file->private_data = head;
2472 tomoyo_notify_gc(head, true);
2473 return 0;
2474 }
2475
2476 /**
2477 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2478 *
2479 * @file: Pointer to "struct file".
2480 * @wait: Pointer to "poll_table".
2481 *
2482 * Waits for read readiness.
2483 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2484 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2485 */
2486 int tomoyo_poll_control(struct file *file, poll_table *wait)
2487 {
2488 struct tomoyo_io_buffer *head = file->private_data;
2489 if (!head->poll)
2490 return -ENOSYS;
2491 return head->poll(file, wait);
2492 }
2493
2494 /**
2495 * tomoyo_set_namespace_cursor - Set namespace to read.
2496 *
2497 * @head: Pointer to "struct tomoyo_io_buffer".
2498 *
2499 * Returns nothing.
2500 */
2501 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2502 {
2503 struct list_head *ns;
2504 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2505 head->type != TOMOYO_PROFILE)
2506 return;
2507 /*
2508 * If this is the first read, or reading previous namespace finished
2509 * and has more namespaces to read, update the namespace cursor.
2510 */
2511 ns = head->r.ns;
2512 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2513 /* Clearing is OK because tomoyo_flush() returned true. */
2514 memset(&head->r, 0, sizeof(head->r));
2515 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2516 }
2517 }
2518
2519 /**
2520 * tomoyo_has_more_namespace - Check for unread namespaces.
2521 *
2522 * @head: Pointer to "struct tomoyo_io_buffer".
2523 *
2524 * Returns true if we have more entries to print, false otherwise.
2525 */
2526 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2527 {
2528 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2529 head->type == TOMOYO_PROFILE) && head->r.eof &&
2530 head->r.ns->next != &tomoyo_namespace_list;
2531 }
2532
2533 /**
2534 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2535 *
2536 * @head: Pointer to "struct tomoyo_io_buffer".
2537 * @buffer: Poiner to buffer to write to.
2538 * @buffer_len: Size of @buffer.
2539 *
2540 * Returns bytes read on success, negative value otherwise.
2541 */
2542 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2543 const int buffer_len)
2544 {
2545 int len;
2546 int idx;
2547
2548 if (!head->read)
2549 return -ENOSYS;
2550 if (mutex_lock_interruptible(&head->io_sem))
2551 return -EINTR;
2552 head->read_user_buf = buffer;
2553 head->read_user_buf_avail = buffer_len;
2554 idx = tomoyo_read_lock();
2555 if (tomoyo_flush(head))
2556 /* Call the policy handler. */
2557 do {
2558 tomoyo_set_namespace_cursor(head);
2559 head->read(head);
2560 } while (tomoyo_flush(head) &&
2561 tomoyo_has_more_namespace(head));
2562 tomoyo_read_unlock(idx);
2563 len = head->read_user_buf - buffer;
2564 mutex_unlock(&head->io_sem);
2565 return len;
2566 }
2567
2568 /**
2569 * tomoyo_parse_policy - Parse a policy line.
2570 *
2571 * @head: Poiter to "struct tomoyo_io_buffer".
2572 * @line: Line to parse.
2573 *
2574 * Returns 0 on success, negative value otherwise.
2575 *
2576 * Caller holds tomoyo_read_lock().
2577 */
2578 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2579 {
2580 /* Delete request? */
2581 head->w.is_delete = !strncmp(line, "delete ", 7);
2582 if (head->w.is_delete)
2583 memmove(line, line + 7, strlen(line + 7) + 1);
2584 /* Selecting namespace to update. */
2585 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2586 head->type == TOMOYO_PROFILE) {
2587 if (*line == '<') {
2588 char *cp = strchr(line, ' ');
2589 if (cp) {
2590 *cp++ = '\0';
2591 head->w.ns = tomoyo_assign_namespace(line);
2592 memmove(line, cp, strlen(cp) + 1);
2593 } else
2594 head->w.ns = NULL;
2595 } else
2596 head->w.ns = &tomoyo_kernel_namespace;
2597 /* Don't allow updating if namespace is invalid. */
2598 if (!head->w.ns)
2599 return -ENOENT;
2600 }
2601 /* Do the update. */
2602 return head->write(head);
2603 }
2604
2605 /**
2606 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2607 *
2608 * @head: Pointer to "struct tomoyo_io_buffer".
2609 * @buffer: Pointer to buffer to read from.
2610 * @buffer_len: Size of @buffer.
2611 *
2612 * Returns @buffer_len on success, negative value otherwise.
2613 */
2614 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2615 const char __user *buffer, const int buffer_len)
2616 {
2617 int error = buffer_len;
2618 size_t avail_len = buffer_len;
2619 char *cp0 = head->write_buf;
2620 int idx;
2621 if (!head->write)
2622 return -ENOSYS;
2623 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2624 return -EFAULT;
2625 if (mutex_lock_interruptible(&head->io_sem))
2626 return -EINTR;
2627 head->read_user_buf_avail = 0;
2628 idx = tomoyo_read_lock();
2629 /* Read a line and dispatch it to the policy handler. */
2630 while (avail_len > 0) {
2631 char c;
2632 if (head->w.avail >= head->writebuf_size - 1) {
2633 const int len = head->writebuf_size * 2;
2634 char *cp = kzalloc(len, GFP_NOFS);
2635 if (!cp) {
2636 error = -ENOMEM;
2637 break;
2638 }
2639 memmove(cp, cp0, head->w.avail);
2640 kfree(cp0);
2641 head->write_buf = cp;
2642 cp0 = cp;
2643 head->writebuf_size = len;
2644 }
2645 if (get_user(c, buffer)) {
2646 error = -EFAULT;
2647 break;
2648 }
2649 buffer++;
2650 avail_len--;
2651 cp0[head->w.avail++] = c;
2652 if (c != '\n')
2653 continue;
2654 cp0[head->w.avail - 1] = '\0';
2655 head->w.avail = 0;
2656 tomoyo_normalize_line(cp0);
2657 if (!strcmp(cp0, "reset")) {
2658 head->w.ns = &tomoyo_kernel_namespace;
2659 head->w.domain = NULL;
2660 memset(&head->r, 0, sizeof(head->r));
2661 continue;
2662 }
2663 /* Don't allow updating policies by non manager programs. */
2664 switch (head->type) {
2665 case TOMOYO_PROCESS_STATUS:
2666 /* This does not write anything. */
2667 break;
2668 case TOMOYO_DOMAINPOLICY:
2669 if (tomoyo_select_domain(head, cp0))
2670 continue;
2671 /* fall through */
2672 case TOMOYO_EXCEPTIONPOLICY:
2673 if (!strcmp(cp0, "select transition_only")) {
2674 head->r.print_transition_related_only = true;
2675 continue;
2676 }
2677 /* fall through */
2678 default:
2679 if (!tomoyo_manager()) {
2680 error = -EPERM;
2681 goto out;
2682 }
2683 }
2684 switch (tomoyo_parse_policy(head, cp0)) {
2685 case -EPERM:
2686 error = -EPERM;
2687 goto out;
2688 case 0:
2689 switch (head->type) {
2690 case TOMOYO_DOMAINPOLICY:
2691 case TOMOYO_EXCEPTIONPOLICY:
2692 case TOMOYO_STAT:
2693 case TOMOYO_PROFILE:
2694 case TOMOYO_MANAGER:
2695 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2696 break;
2697 default:
2698 break;
2699 }
2700 break;
2701 }
2702 }
2703 out:
2704 tomoyo_read_unlock(idx);
2705 mutex_unlock(&head->io_sem);
2706 return error;
2707 }
2708
2709 /**
2710 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2711 *
2712 * @head: Pointer to "struct tomoyo_io_buffer".
2713 *
2714 * Returns 0.
2715 */
2716 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2717 {
2718 /*
2719 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2720 * observer counter.
2721 */
2722 if (head->type == TOMOYO_QUERY &&
2723 atomic_dec_and_test(&tomoyo_query_observers))
2724 wake_up_all(&tomoyo_answer_wait);
2725 tomoyo_notify_gc(head, false);
2726 return 0;
2727 }
2728
2729 /**
2730 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2731 */
2732 void tomoyo_check_profile(void)
2733 {
2734 struct tomoyo_domain_info *domain;
2735 const int idx = tomoyo_read_lock();
2736 tomoyo_policy_loaded = true;
2737 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2738 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2739 const u8 profile = domain->profile;
2740 const struct tomoyo_policy_namespace *ns = domain->ns;
2741 if (ns->profile_version != 20110903)
2742 printk(KERN_ERR
2743 "Profile version %u is not supported.\n",
2744 ns->profile_version);
2745 else if (!ns->profile_ptr[profile])
2746 printk(KERN_ERR
2747 "Profile %u (used by '%s') is not defined.\n",
2748 profile, domain->domainname->name);
2749 else
2750 continue;
2751 printk(KERN_ERR
2752 "Userland tools for TOMOYO 2.5 must be installed and "
2753 "policy must be initialized.\n");
2754 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2755 "for more information.\n");
2756 panic("STOP!");
2757 }
2758 tomoyo_read_unlock(idx);
2759 printk(KERN_INFO "Mandatory Access Control activated.\n");
2760 }
2761
2762 /**
2763 * tomoyo_load_builtin_policy - Load built-in policy.
2764 *
2765 * Returns nothing.
2766 */
2767 void __init tomoyo_load_builtin_policy(void)
2768 {
2769 /*
2770 * This include file is manually created and contains built-in policy
2771 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2772 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2773 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2774 */
2775 #include "builtin-policy.h"
2776 u8 i;
2777 const int idx = tomoyo_read_lock();
2778 for (i = 0; i < 5; i++) {
2779 struct tomoyo_io_buffer head = { };
2780 char *start = "";
2781 switch (i) {
2782 case 0:
2783 start = tomoyo_builtin_profile;
2784 head.type = TOMOYO_PROFILE;
2785 head.write = tomoyo_write_profile;
2786 break;
2787 case 1:
2788 start = tomoyo_builtin_exception_policy;
2789 head.type = TOMOYO_EXCEPTIONPOLICY;
2790 head.write = tomoyo_write_exception;
2791 break;
2792 case 2:
2793 start = tomoyo_builtin_domain_policy;
2794 head.type = TOMOYO_DOMAINPOLICY;
2795 head.write = tomoyo_write_domain;
2796 break;
2797 case 3:
2798 start = tomoyo_builtin_manager;
2799 head.type = TOMOYO_MANAGER;
2800 head.write = tomoyo_write_manager;
2801 break;
2802 case 4:
2803 start = tomoyo_builtin_stat;
2804 head.type = TOMOYO_STAT;
2805 head.write = tomoyo_write_stat;
2806 break;
2807 }
2808 while (1) {
2809 char *end = strchr(start, '\n');
2810 if (!end)
2811 break;
2812 *end = '\0';
2813 tomoyo_normalize_line(start);
2814 head.write_buf = start;
2815 tomoyo_parse_policy(&head, start);
2816 start = end + 1;
2817 }
2818 }
2819 tomoyo_read_unlock(idx);
2820 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2821 tomoyo_check_profile();
2822 #endif
2823 }